Versum Solo A and D stings combined with Spirochore Tungsten G and C are a great pairing. The Versum have a quick, easy response and the tone is warm, yet has a strong, clear edge. The harmonic overtones are richer and more present with greater clarity of intonation. Combined, the Versum and Spirochore enhance all the great qualities my cello already possesses: darkness, depth, power, and a complex color palate. I couldn't be happier!